Motor-control system.



F. H. SHEPARD.

MOTOR CONTROL SYSTEM. Arrmonlol Mum In 15, 1905.

Patented Jan. 25, 1910.

IIIIIIIMI} l'lllm i lmli WITNESSES: gj m INVENTOR BY 5i A'TTORNEY 'rnnnoio H. snnnnrm,

tllNITED STAlIEt-l t.

.01" PITTSE'UILG, PENNEvYLVANIA, ASSIGNUR TO ff ffi ELECTRIC 86 IVIANUEACTURING} KLOMPAJNY, [a CUEZLPOL'EHETION 01* .i.

MOTOE-CONTRGL SYS'lEl /Z.

of Pittsburg. inv the county of Allegheny aucl.

State: of Pennsylvania, have imfentect anew antl useful Improvement in Motion Control oyoemsg ot which the following is o. s peciti cation. I r My lllVEIllilOn relates to systems for gov- Specification of Letters Patent.

Application filed May 15, 1905.

'charging, system nntl may otwzifi erning the charging and discharging of 0 curry electric batteries, and particularly l I i motor circuit for its energy and the control "attery systems thathre 'usccl in connecwith control systems for electric ;rail- 'vehiclc motors.

thioohject. of my ii'iv'eutionis to prrwitle ins tor intermittin-gly charging a plural 'chunge-oyer switch for nlternz-ite the r connections respectively; cluirging hue to the control iino, u o rice llutentett Jon. Serial No. 260,48'2.

verso one of the two is inttepentlont of t t for use, I I 60 The single figure of the acconip drawing shows ctiagrnnnnot :1. ha I sy tom that embodies my hwent. mch.

for convenience of illuetrotiou the ouppi} circu t dependent upon a compress; 2365 v system supplied from the batteries is oppiietl. to a single motor.

of control tine supply batteries that shall insure the'avniluhility for service of one or more oit'so'hl h-Littcriesat anytime. I

Ia. furthor object of my inventionis to an I toouzticallf Jrorent the dischtir 'e of a :bat- I to; which is connected to the ohirg'ing circ in case the apphetl voltage tolls below i =1 pretlotorlnined amount. I f

.t t is usual to provide electric rz-ulwoy Vehiotcs; which are equipped with air compressors and storagetanks, for pneumatic brakes pies a plurality of positions a, 7), o and dytf,

or control, with 2i governor for'tiutonmticully applying power to the compressor motor when the pressure in the storage, tank tails 1 euro in tho supply tanks is roughly related to tho amount of current taken from the con- The use ot' 'in the usual. manner.

trol butteriesjsiuee every stop or stow-down involves the use of the control s t-stem to v again accelerate tho vehicle. so that on :ii' 1 rzmge nent which supplies chmrgiug current L to --t -he batteries onlv when thocompressor inotoinis in oporntioulmijc' easily be urtuingetl to fully recharge u l'mttcry in n "time Hlll)SlI\ll-' tmily equal to that (luring which it was In, f

operntion.

The hatter) supplv circuit does not neces- I 1' i n l A 1 snmly depend upon an 'mr compressormotor fillCtl'll for its'powei', but may he Supplied from any convenient -sou'rcr' It l8 more (lesiruhlc, however. to select u Source which ,wiil

i prosoure storage tank .18, and "a pit;

Referring to the drawing. itirect current electrical, energy is supplied t'rono Qooitive 76- line conductor 1 through at nee to 2.;- motor -3. The resistance :3 and n. mun; lino (3lICltlt-l)i'ztliQl l are controlled by a mentor switch 5 which supplies energy ouogh o contlnctor iv. to :1. phuoiityot act" ,n" hoils 75 63. '7. H mu! 9 from either storuge hat cry 10 om similar battery 11. occorclingto the sition of 21 changeover switch 12 that i occupy either position or position As the master switch successively occi,

coils (3, T. 8 and 9 are successively octnzi to close the circuit-breaker -l and to shortcircuit the resistance 2, one portion at o. time,- until full line voltage is applied to tho motor. The negative ticrniinaloit' the motor a is connected. to the return line circuit 1,3

Electrical energy may also he applied, through at governor 'H\-\"it :i' 14, to a compressor motor 15 mini to a regm 9o lnting resistance 16, which are coiniectert: in Series; the negativoterminal the re -otanceheing connected to the negative .ti'ue' conductor 13. I The governor switch it comprises o lo tively small cylinder 1?, piped to n tin (in lit A. L i which carriesn contact piece and uctu-' supply ei'iergr tothe buttery (luring 1 suh-x stuntiully lixett'percentage oi time in euch (toy or week without (loingeo coutiuumisly.

such'os u lighting. heating or comprensor motor circuit. Byqgroruhng :1 pair of sumlar hattelies on the some vehicle oml a tcontuct piece of the magnet winding 22' of 2L switch 23 to atetl either a spring 21 to close the com-1 pressor i'uotor circuitor by the tluiti pre in the tank. when it exceeds the spring on. sure. to open the motor c nit. Ehe tank 18 may Supply pressure to uctnute o s;

of brakes in the usual nuniner or for otln-ir its; cnerggv p through the an i ch. 14; iteuergm ioes clone/.21 enmittrom top intermediate the terminals of the resistance 16, that is chosen to give a proper voltage for charging the batteries 10 and 11.

\Vhen the change-over switch 12 occupies position X, a circuit is completed, from tap 24 of the resistance 16, through the switch 23, terminals 25 and 26 of switch 12, to one terminal of the battery 11, the other termiml of the battery being connected, through terminals 27 and 28 of switch 12, to negative line terminal 13. A circuit is also completed, from the battery 10, through terminals 29 and 30 of switch 12 and the con" ductor K, to the control system as hereinbefore described, the return circuit being completed through a conductor W and terminals 31 and 32 of switch 12. When switch 12 is in position Y, a circuit is completed in a simllar manner except that the batteries are interchanged, current being applied from tap 2% to the battery 10 and current being applied to line K from battery 11, since terminals 25, 23, 31 and 30 are respectively connected to terminals 29, 32, 26 and 27. The switch 23 is closed by current flowing through the coil 22 and the resistance 16 to allow the battery that is connected to the tap 24: to be charged when current is supplied to the resistance 16, but is opened to prevent the battery from being short-circuited through a portion of the resistance and also to prevent it from delivering current to the pump motor or other translating deyice when no charging current is supplied to the batter Although i have shown and described a specific clrcuit arrangement and a single motor controlled by a plurality of electromagnetic switches which are energized by current from a storage battery system embodyin my invention, I wish it to be under- 'stood that said system may supply energy for any convenient purpose and that any arrangement which does not substantially depart from the spirit of my invention shall be included in its scope.

I claim as my invention:

1. The combination with a fluid compressor, a storage reservoir supplied there- 'from, a. driving motor for the compressor,

a resistance in series therewith, a supply circuit for the motor, and means for automatically closing the supply circuit when the fluid-pressure in the reservoir falls below a predetermined amount, of an auxiliary circuit connected to said resistance intermediate its ends, and means for closing the auxiliary circuit only' when energy is supplied to the motor.

2 The combination with a fluid compressor, a driving motor therefor, a motor supply circuit and a resistance in series with the motor, of a battery charging circuit connected to said resistance intermediate its endsfmeans for closing the battery circuit only when energy is supplied to the motor, and means for sup lying energy to the motor only when the tiiiid-pressure in the reservoir falls below a predetermined limit.

3. The combination with a storage battery, a charging circuit therefor, and a resistance in parallel circuit with sald battery, of a supply circuit which includes said resistance and from which said charging circuit is derived, means tending to intermittently interrupt the supply circuit, and means for automatically interrupting the charging circuit when the supply circuit is interrupted.

4. The combination with a translating device-to which energy is intermittently supplied, a resistance in series therewith and a battery charging circuit connected to an intermediate point in the resistance, of automatic means for interrupting the charging circuit when the supply circuit is interrupted.

5. The combination with two storage batteries and selective means for connecting one of said batteries to a charging circuit, a resistance in parallel circuit with the one or the other of said batteries and a supply circuit therefor, of means for automatically opening said charging circuit when no current flows in said supply circuit.

6. The combination with a control system, two storage batteries, a selective switch for connecting one of said batteries to a charging circuit and the other to said system, and a resistance in parallel with said charging circuit, of means for closing said charging circuit when current is supplied to said resistance and for automatically opening said circuit when the current ceases.

7. The combination with a storage battery, a receiving circuit and a charging circuit therefor, and a resistance in arallel with said char ing circuit, of means or connecting one portion of said battery to said receiving circuit while the remaining portion is connected to said charging circuit and for interchanging the connections of said battery portions, and means for closing said charging circuit only when energy is supplied thereto. r

8. The combination with a fluid-pressure reservoir, a compressor therefor, an electric driving motor for the compressor and a supply circuit for the motor, of a resistance connected in series with the motor, a battery charging circuit connected to an intermediate point in the resistance, and automatic means indirectly dependent upon the pressure in the storage reservoir for interrupting the battery charging circuit.

9. The combination with an electric circuit comprising one or more translating devices, a resistance in series therewith, a battery-charging circuit connected to said resistance intermediate its ends, a battery-dis charging circuit, and a smrage bwi-tery ODE In testimony whex'eaf, 1 have hel'eunm portlon of WhlCh 1s commente to sari: chzu'gsul'jscrlbed my name, Hus 11th day of May 10 mg cn'cult While the remalnmg pertlun 1s 1905.

connectgd {to szu d dlgchqzglllg cucl ut, oi ERANUES H NHEEHJD means for mtercnangmg Lhe cennectlons 0f smd battery purtlons, and means for closing Witnesses:

szuci charging clrcult only when energy VXTILLIAIKI (100mm supplied ta said translating devices. Emma-1 HINES. 

